Ring Of Fire Sign

                              Colour Doppler - Tubal Ectopic Pregnancy = Ring Of Fire Sign

In 1992 Pellerito et al firstly noted a pattern flow in ectopic pregnancy using endovaginal color imaging. This characteristic round peripheral flow when submitted to spectral analysis demonstrated high-velocity and low impedance. The color pattern they called “ring of fire” and to the spectral finding they called “placental flow”.

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